{"product_id":"sparkwhiz-trailer-u-bolt-kit-for-3-round-axles-7-1-8-u-bolts-fits-1-75-2-springs-corrosion-resistant","title":"SPARKWHIZ Trailer U-Bolt Kit for 3\" Round Axles — 7 1\/8\" U-Bolts, Fits 1.75\"\/2\" Springs, Corrosion-Resistant","description":"\u003cp\u003e\u003cstrong\u003eSPARKWHIZ Trailer U Bolt Kit secures 3\" round axles to 1-3\/4\" or 2\" leaf springs for trailers rated 5,200–7,000 lbs, using four 7 1\/8\" U-bolts, tie plates, and grade hardware.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis heavy-duty U-bolt kit is built to fasten round trailer axles to common leaf spring setups. The package includes everything needed to retrofit or replace worn axle clamps on medium-duty trailers: four U-bolts, eight hex nuts, and two spring tie plates sized for 1.75\" springs. Components are steel with corrosion resistance to stand up to road exposure and seasonal moisture.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this kit fit my trailer axle and spring setup?\u003c\/h3\u003e\n\u003cp\u003eThe SPARKWHIZ kit is engineered for round axles with a 3\" beam diameter on trailers rated between 5,200 and 7,000 pounds. It matches 1.75\" (1-3\/4\") leaf springs and is also compatible with 2\" springs, offering flexibility across common trailer suspensions. Measure your axle diameter and spring width to confirm fit before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for 3\" round axle beam\u003c\/li\u003e\n  \u003cli\u003eWorks with 1.75\" or 2\" leaf springs\u003c\/li\u003e\n  \u003cli\u003eU-bolt length: 7 1\/8\", diameter: 1\/2\"\u003c\/li\u003e\n  \u003cli\u003eIncludes two tie plates sized for 1-3\/4\" springs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat hardware and torque specs are included or required?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships with four 7 1\/8\" U-bolts, eight 1\/2\"-20 hex nuts, and two tie plates. Recommended tightening torque is between 65 and 75 ft-lbs, which helps ensure a secure clamp without overstressing threads or bending the tie plates. Use a calibrated torque wrench and follow a cross-pattern tightening sequence.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4 U-bolts, 1\/2\" diameter, 7 1\/8\" long\u003c\/li\u003e\n  \u003cli\u003e8 hex nuts, 1\/2\"-20 thread size\u003c\/li\u003e\n  \u003cli\u003eTorque range: minimum 65 ft-lbs, maximum 75 ft-lbs\u003c\/li\u003e\n  \u003cli\u003eInstall with a torque wrench in alternating order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is the construction and how does it resist corrosion?\u003c\/h3\u003e\n\u003cp\u003eAll components are fabricated from steel and treated for increased resistance to rust and corrosion, making them suitable for trailers exposed to road salt, humidity, and debris. While not maintenance-free, periodic inspection and re-torqueing will extend the life of the parts. For harsher environments, consider additional rust-preventive coatings or anti-seize on threads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSteel construction engineered for medium-duty trailer loads\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant finish for road exposure\u003c\/li\u003e\n  \u003cli\u003eInspect and re-torque regularly to maintain clamping force\u003c\/li\u003e\n  \u003cli\u003eCompatible with aftermarket rust treatments if desired\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit affect trailer braking or ride stability?\u003c\/h3\u003e\n\u003cp\u003eProperly installed U-bolts and tie plates keep axle alignment and spring position stable, which helps maintain predictable braking behavior and suspension performance. This kit helps restore clamping integrity on worn assemblies, reducing unwanted axle movement that can affect brake balance. It does not alter brake hardware; ensure brakes are serviced separately.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSecures axle to springs for consistent alignment\u003c\/li\u003e\n  \u003cli\u003eReduces axle shift that can impact braking feel\u003c\/li\u003e\n  \u003cli\u003eDoes not replace or modify brake components\u003c\/li\u003e\n  \u003cli\u003eRecommended to check brake adjustment after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The SPARKWHIZ Trailer U-Bolt Kit is intended for owners, mechanics, and fleet operators who need a reliable replacement or upgrade for medium-duty trailers (5,200–7,000 lb range) with 3\" round axles and 1.75\" or 2\" leaf springs. It suits DIY installers with basic hand tools and a torque wrench as well as professional shops performing routine suspension maintenance. If your trailer shows loose U-bolts, uneven spring seating, or minor axle movement, this kit provides the hardware needed to restore secure attachment and maintain safe towing performance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit fit a 3\" round axle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit is made for 3\" round axle beams and trailers rated 5,200–7,000 lbs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What torque should I use for the U-bolts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Torque U-bolts between 65 and 75 ft-lbs using a calibrated torque wrench.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SPARKWHIZ","offers":[{"title":"Default Title","offer_id":67589204967609,"sku":"B0CCJ2RY6Q","price":96.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/sparkwhiz-front-packaging.jpg?v=1790529438","url":"https:\/\/redleafauto.ca\/products\/sparkwhiz-trailer-u-bolt-kit-for-3-round-axles-7-1-8-u-bolts-fits-1-75-2-springs-corrosion-resistant","provider":"Redleaf Auto","version":"1.0","type":"link"}